In this paper we design a stream cipher that uses the algebraic structure of the multiplicative group Z Z * p (where p is a big prime number used in ElGamal algorithm), by defining a quasigroup of order p − 1 and by doing quasigroup string transformations. The cryptograph-ical strength of the proposed stream cipher is based on the fact that breaking it would be at least as hard as solving syste...

In this paper, we examine a recently proposed mode of operation for block ciphers which we refer to as statistical cipher feedback (SCFB) mode. SCFB mode configures the block cipher as a keystream generator for use in a stream cipher such that it has the property of statistical self-synchronization, thereby allowing the stream cipher to recover from bit slips in the communication channel. Stati...

SSC2 is a stream cipher that operates by XORing the output of two \half-ciphers". The rst half-cipher is constructed from a linear feedback shift register (LFSR) with a non-linear lter. The second half-cipher is constructed from a lagged Fibonacci generator (LFG) and a multiplexor that chooses values from the Fibonacci register. The second half-cipher has a small cycle length 2. By XORing the k...

The stream cipher Py, which was designed by Biham and Seberry, is a submission for ECRYPT stream cipher competition. The cipher which is based on two large arrays (one is 256 bytes and the other is 1040 bytes) is specifically designed for high speed software applications (Py is more than 2.5 times faster than the RC4 on Pentium III). The paper, for the first time, detects a weakness in the mech...

In this paper we design a stream cipher that uses the algebraic structure of the multiplicative group ZZp (where p is a big prime number used in ElGamal algorithm), by defining a quasigroup of order p− 1 and by doing quasigroup string transformations. The cryptographical strength of the proposed stream cipher is based on the fact that breaking it would be at least as hard as solving systems of ...

Abstract This survey presents the rich history of Welch-Gong (WG) Stream cipher family. It has been a long journey that lead WG stream ciphers to become practical. The evolutionary path is combination mathematical endeavour and engineering striving transfer pure functions practical encryption algorithms for various applications. began as pioneering work on transformation sequences with 2-level ...

Block cipher system is generally used to encrypt a block of message instead of character by character encryption. Block cipher produces more complexity than stream cipher system. The complexity of block cipher can be increases drastically when we use the binary tree concept for encryption of the message. In this paper, we provide an approach which increases the complexity of the block cipher sy...

The increasingly widespread use of electronic devices necessitates efficient stream ciphers providing high-throughput encryption with minimal resource usage. MICKEY-128 2.0 is a recent hardware-oriented synchronous stream cypher with a 128-bit key, proposed to the ECRYPT Stream Cipher Project. Using a novel mathematical interpretation of the algorithm, we present a method of parallelizing the s...